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    Wyświetlanie 1-3 z 3
    Tytuł:
    500 years of ecological changes recorded in subfossil Cladocera in a high-altitude, tropical lake Lago de la Luna, central Mexico
    Autorzy:
    Zawisza, E.
    Caballero, M.
    Ruiz-Fernandez, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027080.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    subfossil Cladocera
    crater Nevado de Toluca
    lake sed i ment
    Opis:
    We pres ent the last 500 years of his tory of a high-al ti tude trop i cal lake Lago de la Luna lo cated at Nevado de Toluca crater, Cen tral Mex ico, based on subfossil Cladocera anal y sis. Through the stud ied sed i men tary se quence only five Cladocera spe cies were pres ent. Cladocera com mu nity was dom i nated by lit to ral spe cies (4) and among them one (Ilyocryptus nevadensis) is en demic. The de tailed anal y sis of the sed i ments (ev ery 1 cm) al lowed us to track con tem - po rary cli ma tic and anthropogenic changes. Our re sults showed that Lago de la Luna is a very sen si tive eco sys tem and has strong re sponse to cli ma tic changes. The most re mark able change in the Cladocera com mu nity was ob served between 1683–1780 yr, which was well cor re lated with the Lit tle Ice Age. PCA re sults im plied that mod ern state of the lake Lago de la Luna is very sim i lar to one 400–500 yr ago. Only one pe riod was iden ti fied when hu man im pact was of im por tance. This pe riod seemed to cor re late with changes in the lake eco sys tem due to fish in tro duc tion in the 1950s.
    Źródło:
    Studia Quaternaria; 2012, 29; 23-29
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental changes during the last millennium recorded in subfossil Cladocera, diatoms and sediment geochemistry from Lake El Sol (Central Mexico)
    Autorzy:
    Zawisza, E.
    Cuna, E.
    Caballero, M
    Ruiz-Fernandez, A. C.
    Szeroczyńska, K.
    Woszczyk, W.
    Zawiska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060339.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    crater Nevado de Toluca
    lake sediments
    tropical alpine lake
    palaeolimnology
    last millennium
    Opis:
    High-altitude lakes, which are very sensitive ecosystems and respond rapidly to climatic changes, are one of the best targets for palaeolimnological studies. Here, we present the record of environmental changes over the last millennium that are recorded in the sediments of El Sol, a tropical, high-altitude, volcanic crater lake on the Nevado de Toluca, Central Mexico. Palaeolimnological reconstructions are based on subfossil Cladocera, diatoms, magnetic susceptibility and chemical analysis of the sediments. In general, Cladocera occurring in tropical regions, and especially at high altitude, have been studied very little. Our data indicate that in the sequence studied, the species diversity of subfossil Cladocera is very low. Only four species were recorded, and the assemblage is dominated by littoral species. Two Cladocera taxa, Alona manueli and Ilyocryptus, found at Lake El Sol are endemic. Cladocera, diatoms and the sediment chemistry show changes in Lake El Sol which are mostly related to climate. The most pronounced climatic signal was obtained for the early Little Ice Age (1350–1625 AD). This cold episode was expressed by a reduction in the frequency of zooplankton (individuals/cm2/yr) and diatoms (valves/g of dry sediment) and by changes in the organic carbon content in the sediment. Our results show that human activity was very limited throughout the study period. According to historical data the presence of humans at the lake shore was mostly occasional, usually for ceremonial and ritual purposes, and humans did not have an important influence on the lake ecosystem. Only one period was identified when human activity was important. This period corresponds to the introduction of fish into the lake at the beginning of the 20th century.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 81--90
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Initial time of two high altitude crater lakes (nevado de toluca, central mexico) recorded in subfossil cladocera
    Autorzy:
    Szeroczyńska, Krystyna
    Zawisza, Edyta
    Wojewódka, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2025798.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crater lakes
    Sol and Luna Lakes
    palaeolimnological studies
    Cladocera and chemical components
    Nevado de Toluca
    Central Mexico
    Opis:
    The ob jec tive of this study was the rec og ni tion and re con struc tion of the or i gin of two high al ti tude lakes and the ecolog i cal con di tions of their early ex is tence based on subfossil Cladocera and chem i cal anal y ses. The study fo cused on the old est lac us trine sed i ments from Lake Sol and Lake Luna, lo cated in the crater of Vol cano Nevado de Toluca (Cen tral Mex ico). The Nevado de Toluca crater de vel oped ap prox i mately 12 ka yr BP. Ac cord ing to the lit er a ture, the vol cano was last ac tive ap prox i mately 3.3 ka yr BP, and the lakes de vel oped af ter that erup tion. The re mains of nine Cladocera spe cies were found in the bot tom sed i ments of both lakes. The most dom i nant taxa were two en demic lit toral spe cies: Alona manueli and Iliocryptus nevadensis. The to tal fre quency of Cladocera spec i mens in both of the sed iment cores was very low. No Cladocera re mains were re corded in the sed i ment layer at depths be tween 123–103 m from Lake Luna. The re sults of the lithological and geo chem i cal anal y ses showed that this sed i ment layer was com posed of allochthonous ma te rial, prob a bly orig i nat ing from slid down from the vol ca nic cone. This was sug gested by the con - tent of sil ica (up to 13%), iron (up to 12%), and ti ta nium (up to 4%). The Cladocera re mains re corded in the bot tom sed i - ments sug gested that both res er voirs de vel oped as fresh wa ter lakes at the be gin ning of the sed i men ta tion. The cal i brated ra dio car bon dates ob tained for the bot tom sam ples were 4040 to 3990 yr BP for Lake Luna (129 cm) and 4485 to 4485 yr BP for Lake Sol (89 cm). The ob tained ages were older than the dates of the last erup tion, which oc curred ap prox i mately 3300 yr BP. This re sult was likely re lated to the type of ra dio car bon dated ma te ri als (charcoals).
    Źródło:
    Studia Quaternaria; 2015, 32; 109-116
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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